Skip to main contentFor research purposes only
Research Library
Documentation on compound structure, mechanisms, analytical verification, and the research peptide market. Every article cites peer-reviewed literature and is written for research use only.
PurchasePeptides Alternative: A Supplier That Documents Its Batches (2026)
PurchasePeptides.com went dark in 2026 with no announcement. What to require from a replacement supplier, and how Onward Aminos documents every order. For research purposes only.
PurchasePeptides.com Is Gone: Offline in 2026, No Announcement Located
PurchasePeptides.com went offline suddenly in 2026 — we located no announcement — and the domain no longer resolves. What is known, what is not, and how researchers recover from a no-notice vendor exit.
Lyophilization and Peptide Stability: How Freeze-Drying Protects Research Compounds
A technical look at why research peptides ship as lyophilized powder rather than solution — the freeze-drying process, the degradation pathways it prevents, and what sourcing teams should verify before trusting a batch. For research purposes only.
Epitalon (Epithalamin): Molecular Profile, Telomere Research, and Research Overview
A research overview of epitalon, a synthetic tetrapeptide studied for its relationship to the pineal gland extract epithalamin and effects on telomerase activity in cellular models. Covers molecular structure, the epithalamin connection, and what published research describes about telomere biology mechanisms. For research purposes only.
HPLC Purity Testing for Research Peptides: How the Method Works and What the Numbers Mean
A technical breakdown of reverse-phase HPLC as the primary analytical method for quantifying peptide purity — how the instrumentation works, how area-percent purity is calculated, and what sourcing teams look for in validated test results. For research purposes only.
Research Peptide FDA Enforcement in 2025–2026: What the Regulatory Crackdown Means for Lab Sourcing
A factual analysis of the 2025–2026 FDA enforcement escalation against the research peptide industry. Covers confirmed enforcement events, which compound categories were most affected, and how researchers can adapt sourcing and documentation practices in a high-scrutiny regulatory environment.
Selank: Molecular Profile, GABAergic Mechanisms, and Research Overview
A research overview of Selank, a synthetic heptapeptide derived from the immunomodulatory tetrapeptide tuftsin. Covers molecular structure, the tuftsin relationship, GABAergic and serotonergic modulation research, and what published studies describe about its anxiolytic and cognitive mechanisms in experimental models. For research purposes only.
How BPC-157 Is Synthesized, and Which Impurities That Produces
Reading an impurity profile means reasoning about how the material was made. Solid-phase synthesis of a proline-rich 15-mer, where deletion and truncation sequences come from, why the sequence alone cannot tell you a given lot's profile, and what documentation should show. For research purposes only.
COA Recordkeeping: Building an Audit-Ready Analytical Document File
Certificates are only useful if they can be found and matched to the work they support. Retention periods, file organization, what to log alongside each document, and how to keep records audit-ready.
Confirming Thermal Damage in the Laboratory: Methods and Mass Shifts
Thermal damage is measured, not inferred from packaging condition. What reversed-phase HPLC shows, which mass shifts identify which degradation pathway, why size-exclusion is needed for aggregation, and how to build a defensible record. For research purposes only.
Choosing a Peptide Purity Grade by Application: What Your Assay Actually Requires
Purity specifications should follow the experiment, not the price list. How to match a grade to screening, binding, structural, and reference work, and where a tighter specification stops adding value.
Tirzepatide and Dual Receptor Pharmacology: What Two Targets Change
Tirzepatide engages both the GIP and GLP-1 receptors from a single 39-amino-acid sequence, and not evenly. How a GIP-based scaffold reaches a second receptor, why the common "balanced agonist" description does not hold, and what two targets do to attribution. For research purposes only.
Neuroactive Peptide Profiles in Cognitive Research: Comparative Mechanisms of Semax, Selank, and Dihexa
Research-focused comparison of Semax, Selank, and Dihexa examining BDNF modulation, anxiolytic mechanisms, HGF/c-Met signaling, and neuroprotective findings in published literature.
Growth Hormone Secretagogue (GHS) Peptides: Comparative Research Specifications
Technical comparison of GHS peptides including CJC-1295, Ipamorelin, Sermorelin, and Tesamorelin. Molecular weights, receptor binding sequences, and published pharmacological findings.
Molecular Mechanisms of Longevity Peptides: Comparative Research on Epitalon, FOXO4-DRI, and GHK-Cu
Research comparison of Epitalon, FOXO4-DRI, and GHK-Cu examining telomerase activation, senescent cell clearance, and copper-peptide tissue remodeling in published scientific literature.
Comparative Pharmacodynamics of Metabolic Peptides: GLP-1, GIP, and Dual Agonist Research
Research-focused comparison of GLP-1, GIP, and dual GIP/GLP-1 agonist peptides including tirzepatide — receptor binding, mechanistic differences, and how to select the right compound for specific research designs.
Quality Documentation Standards in Peptide Research: A Comparative Review
Critical assessment of quality documentation in the research peptide industry. What CLIA certification, GMP compliance, and documentation completeness actually mean for researchers evaluating suppliers.
Comparative Mechanisms of Regenerative Peptides: BPC-157, TB-500, and Epitalon
Technical comparison of BPC-157, TB-500, and Epitalon. Amino acid sequences, molecular weights, signaling mechanisms, and research applications from published preclinical literature.